Add selectInput() for template brain

This doesn't do anything yet, and there's a rather bad issue with the NBLAST being carried out too early, without the correct template brain value
Add bridging of neuron

This should be made 'reactive' as now we are bridging twice unnecessarily
Make transformation of traced neuron reactive
Fix error on one-versus-all page with not terminating when scores=NULL
Merge branch 'bridging'

Conflicts:
	server.R
Split one-versus-all table production from plot production